hi my son has a baja 90cc bought it about 4years ago well it wont start all we are getting is a cclicking noise from the round solenoid any one got any advise

 

first check your batterys state of charge it should have an open curcuit voltage of above 11.5 volts if your batterys good then short the selinoid to see if the starter turns over if so youve got a bad connection or senoid